Variable or field declared void error

here is the code

#include <Servo.h>

Servo myservo1;
Servo myservo2;


const int  buttonPin1 = 2;    // Axthe pin that the pushbutton is attached to
const int  buttonPin1a = 3;  //Bx
const int  buttonPin2 = 4;    //Ay
const int  buttonPin2a = 5;    //By


const int serPin1 = 9;       // the pin that the servo is attached to
const int serPin2 = 10; 

int bs1 = 0;         // current state of the button
int bs2 = 0;         // current state of the button
int bs2a = 0;  
int bs1a = 0;

int val= 180;
int val1= 0;
int temp;
int pos=0;
 int flag1=0;
  int flag2=0;

void switchMotor(unsigned int keystate);

void setup() {

  int flag1=0;
  int flag2=0;
  myservo1.attach(9);
  myservo2.attach(10);

  // initialize the button pin as a input:
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin1a, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin2a, INPUT);

//  // initialize the LED as an output:
//  pinMode(serPin1, OUTPUT);
//  pinMode(serPin2, OUTPUT);

  // initialize serial communication:
  Serial.begin(9600);
}
void loop()
{
  myservo1.attach(9);
  myservo2.attach(10);
//  myservo3.attach(11);
  
  digitalWrite(buttonPin1, HIGH);  // pull-up
  digitalWrite(buttonPin1a, HIGH);
  digitalWrite(buttonPin2, HIGH);
  digitalWrite(buttonPin2a, HIGH);
  
  bs1= digitalRead(buttonPin1);   // LOW = 0 HIGH = 1
  bs1a = digitalRead(buttonPin1a);
  bs2 = digitalRead(buttonPin2);
  bs2a = digitalRead(buttonPin2a);
  


//unsigned int keystate = 0;
 // bitWrite(keystate , 0, digitalRead (buttonPin1));
  //bitWrite(keystate , 1, digitalRead (buttonPin1a));
  //bitWrite(keystate , 2, digitalRead (buttonPin2));
  //bitWrite(keystate , 3, digitalRead (buttonPin2a));

  unsigned int keystate = 0;
  if (bs1 == HIGH)
	{
 	bitSet(keystate , 0);  // 1 - 1 (BIN)
	flag1++;
	flag2=0;
	}
  if (bs1a == HIGH)
	{
	bitSet(keystate , 1);  // 2 - 10
	flag1=0;
	flag2++;
	} 
  if (bs2 == HIGH) bitSet(keystate , 2);  // 4 - 100
  if (bs2a == HIGH) bitSet(keystate , 3);// 8- 1000
//  if (bs3 == HIGH) bitSet(keystate , 4); // 16- 10000
//  if (bs3a == HIGH) bitSet(keystate , 5);// 32 - 100000
  
  delay(1000);

  Serial.print("STATE: "); 
  Serial.println(keystate, BIN);  // 0-15 = 0 - 1111
  
  temp= val;
  val = val1;
  val1 = temp;

	
if(flag1==1) switchMotor(keystate);
if(flag2==1) switchMotor(keystate);
}
	

void switchMotor(keystate)
{
  switch (keystate )
  {
  case 1: // bs1 pressed others not
      myservo1.write(val1);              // tell servo to go to position in variable 'pos' 
    delay(1500);                       // waits for the servo to reach the position 
    Serial.println("Ax");
   myservo1.detach();
     delay(1500); 
   break;

  case 2: // bs1a pressed others not
    myservo1.write(val1);
    delay(1500);
    Serial.println("B-x");
    myservo1.detach();
    break;
    
  case 4 : // bs2 pressed others not
    myservo2.write(val1);
    delay(1000);
    Serial.println("Ay");
    myservo2.detach();
    break;

  case 8: // bs2a pressed others not
    myservo2.write(val1);
    delay(1000);
    Serial.println("B-y");
    myservo2.detach();
    break;

  case 5: // bs1 and bs2 pressed others not
    myservo1.write(val1);
    delay(1000);
    Serial.println("AA");
     myservo2.write(val1);
    delay(1000);
     myservo1.detach();
    break;
    
   case 10: // bs1 and bs2 pressed others not
    myservo1.detach();
    myservo2.detach();
    delay(1000);
    Serial.println("BB");
    break;
    
   case 9: // bs1-Ax and bs2a-By pressed others not
   Serial.println("AxBy");
    myservo2.write(val1);
    delay(1500);
    

    Serial.println("AxAy");
    myservo1.detach();
    myservo2.detach();
    break;
    
   case 6: // bs1a-Bx and bs2-Ay pressed others not
   Serial.println("BxAy");
    myservo1.write(val1);
    delay(1500);
    

    Serial.println("AxAy");
    myservo1.detach();
    myservo2.detach();
    break;

 case 0: // no keys pressed;
    break;

  default:  // invalid key combination
    // error message
    Serial.println("Invalid key combination pressed");
    break;
    
    
  }
}
}

here is the error

sketch_jun06a:106: error: variable or field ‘switchMotor’ declared void
sketch_jun06a:106: error: ‘keystate’ was not declared in this scope

Need Help !

void switchMotor(keystate)

What is the type of "keystate"?

(you've declared flag variables in setup, but don't use them)

As a courtesy to other readers, please remove commented-out code before posting, and maybe use the the auto-format tool as well.

it is unsigned int

it is unsigned int

Really?
How does the compiler know that?

(Hint: I didn't post that code snippet for nothing)